The top hose isn't the thermostat housing.
It's called "Housing-coolant outlet" is this diagram where it's leaking? It may be a bad o-ring (4). It may be the tube if the hose clamp was too tight.
That tube (3) is plastic?
I think they may take too much stuff off, but I don't know how tight everything is... is there really a need to pull the radiator?
1. Drain cooling system.
2. Remove radiator.
3. Disconnect engine coolant temperature sensor connector.
4. Remove radiator upper hose at tube (3).
5. Remove heater hose from heater tube at rear of engine.
6. Disconnect heater tube from retaining clip at rear of engine.
7. Disconnect electrical connector from coolant temperature sensor.
8. Remove screws (2) attaching Water housing outlet tube (3) to outlet connector (1).
9. Disengage Water housing outlet tube (3) from outlet connector (1). To remove heater tube, move forward until the tube (3) clears cylinder heads.
Installation:
1. Inspect heater tube O-ring (4). Replace as necessary.
2. Lubricate O-ring (4) with a silicone type grease such as Mopar® Dielectric Grease.
3. Install the Water housing Outlet with tube (3) by inserting tube in-between cylinder heads. Insert tube into outlet connector (1).
4. Attach Water housing Outlet tube (3) to the retaining clip at rear of engine.
5. Install attaching screws and tighten to 3 N·m (30 in. lbs.).
6. Install radiator.
7. Fill cooling system.
8. Operate engine until it reaches normal operating temperature. Check cooling system for correct fluid levels.
Our thermostats appear to be buried on the left side, better accessed with a lift from below.